25640863 has 2 divisors, whose sum is σ = 25640864. Its totient is φ = 25640862.

The previous prime is 25640831. The next prime is 25640893. The reversal of 25640863 is 36804652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25640863 - 2⁵ = 25640831 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25640893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820431 + 12820432.

It is an arithmetic number, because the mean of its divisors is an integer number (12820432).

Almost surely, 2^25640863 is an apocalyptic number.

25640863 is a deficient number, since it is larger than the sum of its proper divisors (1).

25640863 is an equidigital number, since it uses as much as digits as its factorization.

25640863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 25640863 is about 5063.6807758784. The cubic root of 25640863 is about 294.8792496328.

The spelling of 25640863 in words is "twenty-five million, six hundred forty thousand, eight hundred sixty-three".